Nibe CLIMACOOL UCR 30, Installation, Operation & Maintenance Manual

Page: 63 / 84

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Refrigerant Charging
Once leak testing and evacuation are complete, refrigerant
charging may commence . Always refer to the unit
nameplate and guidelines within this section in order to
establish the quantity of refrigerant required . IMPORTANT:
Always introduce refrigerant into a system using a charging
manifold with gauges, along with a refrigerant scale to
accurately weigh the refrigerant cylinder throughout the
entire charging process . As noted in an earlier section, the
end user and installing contractor must provide and field
charge refrigerant R-410A.
CAUTION/ATTENTION
Never dispense refrigerant amounts
into the receiver which may exceed
its liquid holding capacity. The
refrigeration system in our model
UCR030 is equipped with 72
pound receivers (at 80% full). Both
refrigeration systems in models
UCR050 and UCR070 are equipped
with 84 pound receivers (at 80% full).
Jamais distribuer montants réfrigérant
dans le récepteur, qui peut dépasser
sa capacité de rétention liquide. Le
système de réfrigération dans notre
modèle UCR030 est équipé de 72
livres récepteurs (à 80 % complet).
Les deux systèmes de réfrigération
pour les modèles UCR050 et UCR070
sont équipés de récepteurs de 84
livres (à 80 % complet).
As much refrigerant as possible should be charged in this
manner until the receiver holding capacity is achieved, or
system pressures equalize preventing additional refrigerant
from being added . Even if system equalization occurs, it is
still possible to inject liquid refrigerant into the system by
placing the refrigerant cylinder into a luke warm water bath .
NO WARMER THAN 110°F.
WARNING/ADVERTISSEMENT
Cylinder pressures must be closely
monitored whenever a refrigerant
cylinder is being heated in ANY
manner. Allowing pressures to exceed
those for which the cylinder is rated
may result in cylinder rupturing,
personal injury and/or property
damage or even death.
Pression des cylindres doit être
surveillée étroitement chaque fois
qu’une bouteille de réfrigérant est
chauffe de toute manière. Permettant
des pressions supérieures à celles
pour lesquelles le cylindre est évalué
peut entraîner dans le cylindre une
rupture, des blessures corporelles
ou dommages matériels ou même
la mort.
Once system and refrigerant cylinder tank pressures have
equalized, it will be necessary to finish the refrigerant
charging process by gradually metering small bursts of liquid
refrigerant into the suction line of the compressor while it
is operating .
Refrigerant Charging Procedure
CAUTION/ATTENTION
Never attempt to vapor charge into
the system high side, whether the
compressor is ON or OFF. This may
result in refrigerant flowing from the
refrigeration system into the charging
cylinder. Cylinders can quickly be over
pressurized causing them to rupture
with resultant injury or property damage.
Ne jamais essayer de vapeur frais
dans le côté élevé du système, si le
compresseur est ON ou OFF. Cela
peut entraîner dans le réfrigérant
qui se jettent dans le système de
réfrigération dans le cylindre de charge.
Les bouteilles peuvent être rapidement
sursous la pression obligeant à rompre
avec les blessures qui en résultent ou
dommages matériels.
ATTENTION
Never dispense liquid refrigerant into the suction port of a compressor while it
is not running. If adding additional refrigerant is necessary, you must gradually
meter liquid refrigerant into suction port of the compressor ONLY WHILE THE
COMPRESSOR IS RUNNING and only through a metering valve.
The only exception to the above recommendations to meter
in liquid refrigerant into the suction line is the following:
Providing the ENTIRE contents of the refrigerant cylinder
is intended to be added to a refrigeration system . It is
perfectly acceptable to vapor charge from this cylinder into
the compressor suction line until all refrigerant is injected .
The amount of refrigerant required in a system depends on
the following:
•
Model size of the equipment .
•
The distance of the interconnecting lines between
the UCR module and the condenser section .
•
The specific head pressure control methods used for
low ambient operation .
•
What (if any) fan cycling controls are supplied with
the condenser .
•
Whether optional compressor unloading is possible
using hot gas bypass .
Refer to Tables 10 and 11 on page 62 as a guideline to
determine the total amount of additional refrigerant at
initial startup which accommodates all dependant variables
listed above . Although the charge in the table refers to a
winter charge, it is suitable for both winter and summer
operation . The total charge amount is also listed in the
job specific submittal data. The most accurate charge will
appear in the project submittals .